The Messenger of Allah ﷺ loved to have the Muhajirun and Ansar stand close behind him so they could learn and preserve from him.
حدثنا عبد الله بن بكر حدثنا حميد
أن رسول الله ﷺ كان يحب أن يليه المهاجرون والأنصار ليحفظوا عنه
Its isnad is sahih. It was mentioned previously at 13068.